<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>shuxing</title>

</head>
<body>
    <div class = "cls">diyige</div>
    <div class = "cls">dierge</div>
    <div id = "d1">disange</div>
    <div id = "d2">disige</div>
    <div style="background-color: red">diwuge</div>

</body>
</html>